First upload your pics somewhere online (like Photobucket, Facebook, etc.). Click here for an explanation of that. Then click on "Control Panel" on the top left of the forum under the CB7Tuner.com logo. On the left side navigation menu, click "Edit Signature" under Settings & Options. Click the Insert Image 
icon, and paste the link to your pic. Hope that helps!
icon, and paste the link to your pic. Hope that helps!